This transparent plastic goniometer permits observation of a joint's axis of motion and its range of motion measurements of MCPs, PIPs and DIPS. The primary purpose of this device is to assist in physical therapy by determining range of motion of a finger joint as well as evaluating and gauging recovery after surgery or physical therapy. The 120° head has three scales calibrated to be used with the ISOM (International Standards of Measurement, STFR) system.